My boss ask if two furnaces can control one damper independantly. I have not seen the job but was told there is one fresh air inlet that is piped into two seperate furnaces via the return duct. This air damper is to open, only when at least one of the two furnaces are running, does not matter which, and to be open when both are running. The furnaces are not twined, each have a seperate T-Stat and control different rooms. How can I control this damper with two furnaces, but not to back-feed to the furnace that is off?
I'm an HVAC/R service Tech! Just have not got enough post to be pro yet.